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Abiotic reactions between nitrate and either Fe(II)-EDTA or Fe(II)-NTA in anoxic media without cells (Fig. S1); concentrations of predominant Fe and EDTA species in media B and C at 25°C and pH 7, determined by the Visual MinTEQ version 3.0 software (Table S1); supplemental text: effect of different CAP concentrations on growth of and oxygen utilization by Acidovorax sp. 2AN in aerobic medium (Fig. S2); Fe(II)-EDTA oxidation in cell suspensions of resting cells of Acidovorax sp. 2AN and Dechloromonas sp. UWNR4 (Fig. S3); mean Fe(II)-EDTA oxidation rates detrmined by linear regression analysis of the changes in Fe(II)-EDTA concentrations over time (Table S2).
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